refactor: remove CJS ssr output format

[patak-dev]

Description

We're gathering feedback about the future removal of CJS SSR Format here:

• Removing `ssr.format: 'cjs'` #13816

This PR implements the removal to show the complexity that we'll be eliminating.

---

What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

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[patak-dev]

/ecosystem-ci run

[patak-dev]

Vue projects are failing because of this conditional in vite-plugin-vue.

Qwik has a conditional on ssr.format here.

[patak-dev]

/ecosystem-ci run

[patak-dev]

/ecosystem-ci run

[vite-ecosystem-ci]

📝 Ran ecosystem CI: Open

suite	result
analogjs	✅ success
astro	✅ success
histoire	✅ success
ladle	✅ success
laravel	✅ success
marko	✅ success
nuxt	❌ failure
nx	✅ success
previewjs	✅ success
qwik	❌ failure
rakkas	✅ success
sveltekit	✅ success
unocss	❌ failure
vite-plugin-pwa	✅ success
vite-plugin-ssr	❌ failure
vite-plugin-react	✅ success
vite-plugin-react-pages	❌ failure
vite-plugin-react-swc	✅ success
vite-plugin-svelte	❌ failure
vite-plugin-vue	❌ failure
vite-setup-catalogue	✅ success
vitepress	❌ failure
vitest	✅ success

[patak-dev]

/ecosystem-ci run

[vite-ecosystem-ci]

📝 Ran ecosystem CI: Open

suite	result
analogjs	✅ success
astro	✅ success
histoire	❌ failure
ladle	❌ failure
laravel	✅ success
marko	✅ success
nuxt	✅ success
nx	✅ success
previewjs	✅ success
qwik	✅ success
rakkas	✅ success
sveltekit	✅ success
unocss	✅ success
vite-plugin-pwa	✅ success
vite-plugin-ssr	✅ success
vite-plugin-react	✅ success
vite-plugin-react-pages	❌ failure
vite-plugin-react-swc	✅ success
vite-plugin-svelte	❌ failure
vite-plugin-vue	✅ success
vite-setup-catalogue	✅ success
vitepress	✅ success
vitest	✅ success

[patak-dev]

Added back the types temporarily so we can test ecosystem CI, see results here (same errors as in main). The change is reverted and only the legacy empty object is kept.

[sapphi-red]

Oops the fix foo comment closed this PR 😅

[sapphi-red]

/ecosystem-ci run

[vite-ecosystem-ci]

📝 Ran ecosystem CI: Open

suite	result
analogjs	✅ success
astro	✅ success
histoire	❌ failure
ladle	❌ failure
laravel	❌ failure
marko	✅ success
nuxt	✅ success
nx	✅ success
previewjs	✅ success
qwik	❌ failure
rakkas	✅ success
sveltekit	✅ success
unocss	✅ success
vite-plugin-pwa	✅ success
vite-plugin-ssr	✅ success
vite-plugin-react	✅ success
vite-plugin-react-pages	✅ success
vite-plugin-react-swc	✅ success
vite-plugin-svelte	❌ failure
vite-plugin-vue	✅ success
vite-setup-catalogue	✅ success
vitepress	❌ failure
vitest	✅ success

[sapphi-red]

It seems laravel is failing with an error that could be a bug.
https://github.com/vitejs/vite-ecosystem-ci/actions/runs/6195012334/job/16820400780#step:8:390

I reran once so I guess it's not a flaky fail

[patak-dev]

@dominikg, did you say the laravel fail happens in main too after updating vite-ecosystem-ci? I see it working here though: https://github.com/vitejs/vite-ecosystem-ci/actions/runs/6194105986/job/16816620515

laravel/vite-plugin doesn't seems to be using this feature: https://github.com/search?q=repo%3Alaravel%2Fvite-plugin+buildSsrCjsExternalHeuristics&type=pullrequests

[sapphi-red]

laravel/vite-plugin uses vitest ^0.25.2 (0.25.8) and that might be the problem.
0.25.8 is released in 2022/12 and I won't be surprised if it's not compatible with Vite 5.

[sapphi-red]

I removed some more unused codes.

[sapphi-red]

I ran ecosystem-ci locally and the fail reproduced. After upgrading Vitest, the tests passed, so I created a PR: laravel/vite-plugin#246
I guess Vitest was relying on CJS ssr output format in old versions.